Apparatus for condensing light from multiple sources using Bragg gratings
AssigneeSBG Labs, Inc.
InventorsMilan Momcilo Popovich, Jonathan David Waldern
Life of this patent
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Abstract
A color sequential illumination device including in series: first and second light sources; a condenser lens; and a grating device. The grating device includes at least one Bragg grating. The condenser lens directs light from the first and second sources into the grating device at first and second incidence angles respectively. The grating device diffracts light from the first and second sources into a common direction. Desirably, the Bragg gratings are Electrically Switchable Bragg Gratings. In one embodiment the light sources are Light Emitting Diodes. Alternatively lasers may be used.
Claims25
An illumination device comprising;
- a first and a second light source wherein the light from the first light source and the second light source are pulsed out of phase;
- a condenser lens in series with the first and the second light sources wherein the condenser lens directs light from the first light source and the second light source into a light input port at a first and a second incidence angle respectively;
- and
- a grating device in series with the condenser lens, wherein the grating device comprises at least one Bragg grating, the light input port and a light output port and the grating device is operative to diffract light from the first light source and the second light source out of the light output port in a common direction.
Dependencies are inferred from the claim text.